Avira free not downloading properly to laptop

have an asus laptop with win7. i uninstalled Kapersky antivirus and proceeded to download avira free from another link here on tspot. i choose the option to run, as opposed to save or cancel and it begins the initial download. after its finished it simply disappears. no idea where it went and i cant find it anywhere when searching for the file. its supposed to prompt for location to install after, but it never does. my download folder is empty. i tried downloading it twice. same thing happend. is it not compatible with win7 or something? is it possible something hasnt been setup right. this is a brand new laptop.